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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investment securities available for sale |  |  |  |  |
Amortized cost | $ 3,498,087,000 | $ 1,789,509,000 | $ 3,498,087,000 | $ 1,789,509,000 | $ 1,940,763,000
Gross Unrealized Gains | 68,029,000 | 26,156,000 | 68,029,000 | 26,156,000 | 19,823,000
Gross Unrealized Losses | (4,187,000) | (2,531,000) | (4,187,000) | (2,531,000) | (4,539,000)
Fair Value | 3,561,929,000 | 1,813,134,000 | 3,561,929,000 | 1,813,134,000 | 1,956,047,000
Gross realized gains | 469,000 |  | 469,000 |  |
Gross realized losses | 454,000,000 |  | 454,000,000 |  |
Net realized gain (loss) | 15,000 | 437,000 | 15,000 | 2,700,000 |
Government-sponsored entities debt |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 29,882,000 | 40,322,000 | 29,882,000 | 40,322,000 | 25,356,000
Gross Unrealized Gains | 45,000 | 645,000 | 45,000 | 645,000 | 585,000
Fair Value | 29,927,000 | 40,967,000 | 29,927,000 | 40,967,000 | 25,941,000
State and municipal obligations |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 446,068,000 | 183,005,000 | 446,068,000 | 183,005,000 | 204,150,000
Gross Unrealized Gains | 13,236,000 | 5,720,000 | 13,236,000 | 5,720,000 | 5,029,000
Gross Unrealized Losses | (109,000) | (43,000) | (109,000) | (43,000) | (764,000)
Fair Value | 459,195,000 | 188,682,000 | 459,195,000 | 188,682,000 | 208,415,000
Mortgage-backed securities |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 3,008,562,000 | 1,566,182,000 | 3,008,562,000 | 1,566,182,000 | 1,711,257,000
Gross Unrealized Gains | 54,671,000 | 19,791,000 | 54,671,000 | 19,791,000 | 14,209,000
Gross Unrealized Losses | (4,078,000) | (2,488,000) | (4,078,000) | (2,488,000) | (3,775,000)
Fair Value | 3,059,155,000 | 1,583,485,000 | 3,059,155,000 | 1,583,485,000 | 1,721,691,000
Corporate securities. |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 13,575,000 |  | 13,575,000 |  |
Gross Unrealized Gains | 77,000 |  | 77,000 |  |
Fair Value | 13,652,000 |  | 13,652,000 |  |
Mortgage-backed securities issued by private label holdings |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Fair Value | $ 0 | $ 0 | $ 0 | 0 | $ 0
VISA Class B Shares |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Net realized gain (loss) |  |  |  | 5,400,000 |
Securities other than VISA Class B Share |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Net realized gain (loss) |  |  |  | $ 2,700,000 |

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